Synthesis and Characterization of Rutile TiO2Nanopowders Doped with Iron Ions

Abstract

Titanium dioxide nanopowders doped with different amounts of Fe ions were prepared by coprecipitation method. Obtained materials were characterized by structural (XRD), morphological (TEM and SEM), optical (UV/vis reflection and photoluminescence, and Raman), and analytical techniques (XPS and ICP-OES). XRD analysis revealed rutile crystalline phase for doped and undoped titanium dioxide obtained in the same manner. Diameter of the particles was 5–7 nm. The presence of iron ions was confirmed by XPS and ICP-OES. Doping process moved absorption threshold of TiO2into visible spectrum range. Photocatalytic activity was also checked. Doped nanopowders showed normal and up-converted photoluminescence.

TiO2 Processed by pressurized hot solvents as a novel photocatalyst for photocatalytic reduction of carbon dioxide

“…3. Two main components, attributed to lattice O 2− in TiO 2 (the peak at 529.6 ± 0.1 eV) and the O 2 − ions in TiO 2 crystal lattice as well as hydroxyl groups (the peak at 530.5 ± 0.1 eV) [32][33][34], can be distinguished in the O 1 s peaks. The determined ratio of hydroxyls to the total oxygen present on the surface increases in the order: TiO 2 P25 (7.8%) <TiO 2 (M) (14.4%) <TiO 2 (E) (24.9%), confirming the highest concentration of hydroxyl ions around the vacant sites observed for TiO 2 (E).…”

A method for large-scale synthesis of Al-doped TiO2nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

“…That oxygen deficiency produces Ti 2 O 3 crystals in 60%SCL and g pow =19 g min −1 condition. In addition, they may indicate that Aldoped TiO 2 nanopowder was positively charged due to Al 3+ ion doping [27]. Actually, the Al-doped TiO 2 nanoparticles could be dispersed in the purified water, while TiO 2 nanoparticles were settled down.…”

Influence of annealing on Fe-doped TiO2 powders using co-precipitation technique

“…TiO2 can be classified into three crystalline phases: anatase, rutile, and brookite. Rutile is the most stable phase and it is usually obtained after annealing at temperature above 500 o C [3]. Also, TiO2 is in the visible light region and its band gap is 3.0 eV for rutile and 3.2 eV for anatase crystalline phase.TiO2 can be greatly improved by doping with metal ions, such as nickel, chromium, iron, vanadium, and zinc etc.…”